关键词: 淮北矿区, 多次跨采, 中空注浆锚索, 破坏特征, 控制对策

Abstract: Although high-frequent maintenance work has been performed on roadways affected by multiple overhead mining in Huaibei mining area, these roadways still cannot meet the requirement of normal coal production．Taking II82 gallery in Luling coal mine as an example，we summarized four common failure characteristics, namely the breakthrough of mental net joint，floor heaving，ingression of support leg，and asymmetric deformation of U-steel support based on the comprehensive analysis of engineering geological conditions．The deformation mechanism of roadways affected by multiple overhead mining was studied by theoretical analysis and numerical simulation，enhanced control technology including new hollow grouted anchor cable，high-effective bolt and grouting reinforcement technique was put forward．Field practice shows that the deformation affected by multiple overhead mining can be effectively controlled by using the supporting technology of hollow grouted anchor cable combined with high-effective bolt. Roof-to-floor relative displacement ranged from 126 to 393 mm after mining，which can meet normal production demand with routine maintenance．

Key words: Huaibei mining area, multiple overhead mining, hollow grouted anchor cable, failure characteristics, control measures